package com.itheima.demo;

public class test_7 {
    public static void main(String[] args) {
        StringBuilder sb=new StringBuilder();

        sb.append(123);
        sb.append("嗯嗯");
        sb.append('3');
        String s = sb.toString();
        System.out.println(s);
        System.out.println("==========");

        StringBuilder sdf = new StringBuilder();
        sdf.append("ghj").append('6').append(3.14);
        System.out.println(sdf);

    }
}
